Solid electrolyte material, solid electrolyte layer, and all solid state battery

Patent metadata

Field	Value
Publication number	US-11942596-B2
Application number	US-201916703141-A
Country	US
Kind code	B2
Filing date	Dec 4, 2019
Priority date	Aug 31, 2017
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

A solid electrolyte material that includes a composite oxide containing Li and Bi, and at least one solid electrolyte having a garnet structure, a perovskite structure, and a LISICON structure.

First claim

The invention claimed is:

1. A solid electrolyte material comprising:
a composite oxide containing Li and Bi; and
at least one solid electrolyte having a garnet structure, a perovskite structure, and a LISICON structure,
wherein a content of the composite oxide is 0.5% by volume to less than 20% by volume.

2. The solid electrolyte material according to claim 1 , wherein the solid electrolyte has a garnet structure or a LISICON structure.

3. The solid electrolyte material according to claim 1 , wherein the solid electrolyte has a garnet structure.

4. The solid electrolyte material according to claim 3 , wherein the garnet structure is represented by a composition formula (Li [7-ax-(b-4)y] A X ) La 3 Zr 2-y B y O 12 , wherein, A is at least one element selected from the group consisting of Ga, Al, Mg, Zn, and Sc; B is at least one element selected from the group consisting of Nb, Ta, W, Te, Mo, and Bi; 0≤x≤0.5; 0≤y≤2.0; a is an average valence for A; and b is an average valence for B.

5. The solid electrolyte material according to claim 3 , wherein the garnet structure is (Li 6.4 Ga 0.05 Al 0.15 )La 3 Zr 2 O 12 , (Li 6.4 Al 0.2 )La 3 Zr 2 O 12 , (Li 6.4 Ga 0.15 Sc 0.05 )La 3 Zr 2 O 12 , Li 6.75 La 3 (Zr 1.75 Nb 0.25 )O 11 , (Li 6.45 Al 0.1 )La 3 (Zr 1.75 Nb 0.25 )O 12 , (Li 6.175 Al 0.1 )La 3 (Zr 1.475 Ta 0.105 Bi 0.42 )O 12 , or Li 6.6 La 3 (Zr 1.6 Ta 0.4 )O 12 .

6. The solid electrolyte material according to claim 1 , wherein the content of the composite oxide is 1.0% by volume to 10% by volume.

7. The solid electrolyte material according to claim 1 , wherein a molar ratio of Li to Bi in the composite oxide is 1.0 or more.

8. The solid electrolyte material according to claim 1 , wherein the solid electrolyte material further includes at least one of a NASICON-type solid electrolyte, a ramsdellite-type solid electrolyte, and Li-B alumina.

9. The solid electrolyte material according to claim 1 , wherein the Bi in the composite oxide is trivalent Bi or pentavalent Bi.

10. The solid electrolyte material according to claim 1 , wherein the composite oxide containing Li and Bi has a melting point of 800° C. or lower.

11. The solid electrolyte material according to claim 1 , wherein the composite oxide containing Li and Bi further contains at least one of B, Si, P, W, Mo, and Te.

12. The solid electrolyte material according to claim 1 , wherein the solid electrolyte material further includes at least one of a composite oxide composed of La and Zr, a composite oxide composed of Li and Zr, and a composite oxide composed of Li and Al.

13. A solid electrolyte layer comprising a fired product of the solid electrolyte material according to claim 1 .

14. An all solid state battery comprising:
a negative electrode;
a solid electrolyte layer according to claim 13 on the negative electrode; and
a positive electrode on the solid electrolyte layer.

Assignees

• Murata Manufacturing Co

Inventors

• TAKANO Ryohei
• Yoshioka Makoto
• Ishikura Takeo
• Ito Akisuke

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2300/0071

  Oxides · CPC title

• H01M10/0525 Primary

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title